"I was basically hallucinating on a daily basis. It took a year after getting off that particular drug for the chemicals in my brain to settle so that I actually stopped seeing things," she added.

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Reflecting on the intense consequences of the drug, she said: "I'd just be sitting there, seeing a random bee or a bunny." In September, Fergie had announced a split from husband Josh Duhamel after eight years of marriage.

On the difficulty of juggling work and separation struggles, Fergie said:: "I've just released my first solo album in 11 years, and I'm out promoting it. So there's really a lot going on. That's why we wanted to find our footing with our separation before we announced it publicly – to make sure we got it together for our kid." They have a son named Axl, who was born in 2013.